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Nitrogen-plasma Treatment of Parallel-aligned SnO2-nanowire Field-effect Transistors
최용희,나준홍,김재성,주민규,김규태,강필수 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.4
Nitrogen (N2)-plasma treatment and polymethylmethacrylate (PMMA) passivation were carriedout to stabilize the electrical properties of parallel-aligned tin-dioxide (SnO2)-nanowire field-effecttransistors. Treatment led to a positive shift in the threshold voltage, Vth, with a reduction inthe hysteresis in the transfer curves of more than 30% compared to the case without treatment. Passivation was carried using a PMMA coating to prevent changes in the electrical properties overtime. X-ray photoelectron spectroscopy and Auger electron spectroscopy were employed to determinethe chemical mechanisms that resulted in the changes in the electrical properties over time,those changes being attributed to the recombination of oxygen vacancies and carbon contaminantson the surface of the SnO2 nanowires with oxygen in the ambient air.
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합동성 제고를 위한 6·25전쟁 초기 미 해군의 지상군 화력지원 실태 분석
최용희,정경두 육군군사연구소 2018 군사연구 Vol.- No.145
This article analyzes the operational system of the ground force's fire support at a tactical level by the US navy during the Korean War. It gives us an opportunity for thorough evaluation of the joint operations conducted by the US Navy. To do so, I introduced the theoretical approaches of the ground force's fire support and analyzed the fire support system of the US Navy during the Korean War and operational procedure based on the naval gunfire support and CAS(Close Air Support) conducted by the US Navy. Through this research, I discovered that the US naval fire support made a great contribution to the ground operation by adding firepower needed by the ground forces. However, I identified many problems concerning coordination issues with other services. The SFCP(Short Fire Control Party) did not function effectively when coordinating between warships and ground forces during the naval gunfire support. Additionally, ANGLICO (Air and Naval Gunfire Liaison Company) was not utilized properly. The CAS by the US Navy also played a key role in the ground operations as a supplementary fire power, but the US Navy implemented operations under the Air Force operations system which led to a poor outcome considering the amount of input. It turned out, however, that the US Navy showed relatively better performance when they conducted the CAS under the Navy operation system. This led to the US Navy's bias that CAS might not be effective if coordination was not established. This raised many questions about changes needed to improve the coordination and doctrine of the US Navy CAS, but with few results. There has been a great deal of research emphasizing the positive outcomes of the US Navy during the Korean War. However, this article seeks to present a more complete picture by reviewing subcategories of the operations system. I hope to draw attention to the inefficiencies of the system due to lack of coordination to better understand the realities of the war. 본고는 6·25전쟁 초기 미 해군이 수행한 지상군 화력지원의 작전수행 및 협조체계의 실행을 분석하였다. 6·25전쟁 당시 미 해군이 화력지원을 통해 지상의 전황 개선에 기여하였다는 기존의 인식을 배제하고, 미 해군이 지상군을 화력지원하기 위해 구성한 각 군간 작전협조체계를 면밀히 고찰하였다. 6·25전쟁 당시 미 해군이 수행하였던 함포지원사격과 근접항공지원을 중심으로 지상군 화력지원의 협조체계를 고찰해 본 결과, 미 해군의 지상군 화력지원은 작전수행체계상에서 군간 협조와 관련된 다수의 문제를 드러냈다. 함포지원사격의 작전수행간 해안사격통제반은 함정과 지상군 간 협조에서 한계를 드러냈으며, 항공함포연락중대는 적절히 활용되지 못하였다. 미 해군이 수행한 근접항공지원 역시 미 공군의 근접항공지원 수행체계로 작전을 수행하는 가운데, 투입된 전력에 비해서 많은 효과를 거두지 못하였다. 반면에 인천상륙작전에서는 미 해군이 독자적 수행체계로 지상군을 효과적으로 화력지원하였다. 이러한 경험은 미 해군에게 미 공군의 근접항공지원 수행체계를 부정적으로 인식하는 계기가 되었다. 지금까지 6·25전쟁 당시 미 해군에 대한 긍정적 평가만 부각되었던 기존의 연구와 비교하여, 본고는 지상군 화력지원 작전수행의 하부요소까지 면밀하게 검토함으로써 협조체계 및 작전수행체계의 문제를 확인하였다. 한반도에서 수행된 6·25전쟁에서 미 해군의 표적처리를 비롯한 지휘·협조체계와 각 군의 합동성 제고를 위한 노력을 평가함으로써 과거와 우리 군의 현 실태를 비교·진단하고, 향후 합동성을 강화하기 위한 시사점을 제시하고자 한다.
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바나나의 乾燥方法에 따른 品質變化 因子에 대한 反應速度 모델링
金修延,崔容熙 慶北大學校 農業科學技術硏究所 1989 慶北大農學誌 Vol.7 No.-
Kinetics of ascorbic acid and browning that may use on the optimization of food dehydration were evaluated. Banana was chosen for this as the representative test material. We have described the destruction of ascorbic acid and browning as first and zero order reactions. The temperature dependence between two reactions were conducted with Arrhenius equation. Finally we have operated SPSS computer programs reapeatedly that we found very dose value of the parameter between result of ascorbic acid and browning. The attained Kinetic models were well prepared for the value of result experiments and the models may use on optimization for dehydration progress. Destruction rate of ascorbic acid and browning rate were low at initiation of progress, increased to show maximum at the low moisture on mid-progress and then decreased gradually. Freeze drying showed the most constant quality of product in this case.
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